It is not just the HEAT project which is working on trying to find applications of Somewhat Homomorphic Encryption in practice; others around the world are also doing this. In particular Microsoft Research Labs have just announced a project called SEAL(Simple Encrypted Arithmetic Library) which is detailed in the following paper: http://research.microsoft.com/pubs/258435/ManualHE.pdf with code available here http://sealcrypto.codeplex.com/

The Microsoft work is aimed at medical information, in particular bioinfomatics algorithms related to genomic data. The SEAL project is built around the YASHE SHE scheme based on the cyclotomic ring defined by $X^n+1$, for $n$ a power of two. The associated paper explains how large integers and floating point operations can be encoded within the YASHE scheme.